﻿/*
* (c) 2008-9 Jason Frame
* Auxiliary element code based on work by pjesi (http://wtf.hax.is/)
*/
(function ($) {

    /**
    * Initialise input hints on all matched inputs.
    *
    * Usage examples:
    *
    * Add hints to all inputs with the 'title' attribute set:
    *   $('input[title],textarea[title]').inputHint();
    *
    * Add hints to all matched elements, grabbing the hint text from each element's
    * adjacent <kbd/> tag:
    *   $('input').inputHint({using: '+ kbd'});
    *
    * Options keys:
    *  using: jQuery selector locating element containing hint text, relative to
    *         the input currently being considered.
    *  hintAttr - tag attribute containing hint text. Default: 'title'
    *  hintClass - CSS class to apply to inputs with active hints. Default: 'hint'
    */
    $.fn.inputHint = function (options) {

        options = $.extend({ hintClass: 'hint', hintAttr: 'title' }, options || {});

        function hintFor(element) {
            var h;
            if (options.using && (h = $(options.using, element)).length > 0) {
                return h.text();
            } else {
                return $(element).attr(options.hintAttr) || '';
            }
        }

        function showHint() {
            if ($(this).val() == '') {
                $(this).addClass(options.hintClass).val(hintFor(this));
            }
        }

        function removeHint() {
            if ($(this).hasClass(options.hintClass)) $(this).removeClass(options.hintClass).val('');
        }

        this.filter(function () { return !!hintFor(this); })
			.focus(removeHint).blur(showHint).blur();

        this.each(function () {
            var self = this;
            $(this).parents('form').submit(function () { removeHint.apply(self); });
        });

        return this.end(); // undo filter

    };

})(jQuery);